package tw.asap.plus.utils;

import android.location.Location;

/**
 * Description:
 * Created:      [15/11/25]
 * Author:       [Yang]
 **/
public class LocateUtil {

    public static final double pi = 3.14159265358979324;
    public static final double a = 6378245.0;
    public static final double ee = 0.00669342162296594323;

    public static Location transformFromWGSToGCJ(Location wgLoc) {
        Location mgLoc;
        if (outOfChina(wgLoc.getLatitude(), wgLoc.getLongitude())) {
            mgLoc = wgLoc;
            return mgLoc;
        }
        mgLoc = new Location("");
        double dLat = transformLat(wgLoc.getLongitude() - 105.0, wgLoc.getLatitude() - 35.0);
        double dLon = transformLon(wgLoc.getLongitude() - 105.0, wgLoc.getLatitude() - 35.0);
        double radLat = wgLoc.getLatitude() / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        mgLoc.setLatitude(wgLoc.getLatitude() + dLat);
        mgLoc.setLongitude(wgLoc.getLongitude() + dLon);

        return mgLoc;
    }


    public static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }

    public static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    public static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }

///
///  GCJ-02 坐标转换成 BD-09 坐标
///

//    const double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
//    Location bd_encrypt(Location gcLoc)
//    {
//        double x = gcLoc.getLongitude(), y = gcLoc.getLatitude();
//        double z = sqrt(x * x + y * y) + 0.00002 * sin(y * x_pi);
//        double theta = atan2(y, x) + 0.000003 * cos(x * x_pi);
//        return LocationMake(z * cos(theta) + 0.0065, z * sin(theta) + 0.006);
//    }

    ///
///   BD-09 坐标转换成 GCJ-02坐标
///
///
//    Location bd_decrypt(Location bdLoc)
//    {
//        double x = bdLoc.getLongitude() - 0.0065, y = bdLoc.getLatitude() - 0.006;
//        double z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi);
//        double theta = atan2(y, x) - 0.000003 * cos(x * x_pi);
//        return LocationMake(z * cos(theta), z * sin(theta));
//    }
}
